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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9633d0a9face9a1859709f8fa8bb141c304e28a8307896388f9bdb96f1ca1c' 
  AND token = 'fi6RkYi276fb5JW3K00Gz1cPkldVvtQ7mVUOCdBcMFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}